Poultry litter increased irrigated cotton N uptake with limited improvement on 15N-labelled urea recovery over one season

Article

Webb, Jackie R., Awale, Rakesh and Quayle, Wendy C.. 2023. "Poultry litter increased irrigated cotton N uptake with limited improvement on 15N-labelled urea recovery over one season." Nutrient Cycling in Agroecosystems. 125 (2), pp. 137-152. https://doi.org/10.1007/s10705-022-10251-z
Article Title

Poultry litter increased irrigated cotton N uptake with limited improvement on 15N-labelled urea recovery over one season

ERA Journal ID5265
Article CategoryArticle
AuthorsWebb, Jackie R., Awale, Rakesh and Quayle, Wendy C.
Journal TitleNutrient Cycling in Agroecosystems
Journal Citation125 (2), pp. 137-152
Number of Pages16
Year2023
PublisherSpringer
Place of PublicationNetherlands
ISSN1385-1314
1573-0867
Digital Object Identifier (DOI)https://doi.org/10.1007/s10705-022-10251-z
Web Address (URL)https://link.springer.com/article/10.1007/s10705-022-10251-z
Abstract

Limited field research has investigated the impact of poultry litter (PL) on urea-nitrogen (N) recovery in irrigated cropping systems. This study investigated the effect of PL (nil or 15t ha−1) on the fate of 15N-labelled urea at different rates (0, 50, 150, and 300 kg N ha−1) and changes in soil N mineralisation-immobilisation dynamics on an irrigated cotton farm. Our study highlighted multiple soil and plant N benefits from the use of PL, while limited improvements were seen on fertiliser 15N plant uptake and recovery. Total 15N recoveries were some of the highest observed for Australian cotton studies (61.0–92.3%) and PL increased overall plant N uptake (398–421 kg ha−1) compared to urea-only treatments (325–370 kg ha−1). Poultry litter stimulated soil NH4-N and NO3-N release at the start of the season then immobilised soil NO3-N for the remainder, which helped to retain residual 15N-urea (12% 15N recovery) in the soil surface after harvest. Despite high total 15N-fertiliser recoveries, the crop sourced most of its N (67.1–92.6%) from existing soil and PL reserves rather than current-season urea, potentially due to high native soil N supply rates and urea immobilisation in the microbial pool. These results confirm the lack of N rate response on yield observed in this study and commonly seen in other cotton farm studies. We suggest future research to follow post-harvest soil N into consecutive growing seasons to determine how to best manage integrated PL-urea applications to preserve soil N and improve fertiliser-N use efficiency.

KeywordsManure ; Irrigation ; Fertiliser retention ; Urea ; Nitrogen uptake
Contains Sensitive ContentDoes not contain sensitive content
ANZSRC Field of Research 2020300204. Agricultural management of nutrients
Public NotesFiles associated with this item cannot be displayed due to copyright restrictions.
Byline AffiliationsDeakin University
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https://research.usq.edu.au/item/z9509/poultry-litter-increased-irrigated-cotton-n-uptake-with-limited-improvement-on-15n-labelled-urea-recovery-over-one-season

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